docs and setup.py updates

[orbeckst]

Contributes to #32

Changes made in this Pull Request:

• authors updated (list people who contributed code/commits, anything else as references)
• added license, repository, pip installation, mailing list to README
• updated User Guide with distributed example
• update metadata in setup.py and build universal wheels

PR Checklist

• [ ] Tests?
• [x] Docs?
• [ ] CHANGELOG updated?
• [x] Issue raised/referenced?

[codecov-io]

Codecov Report

Merging #38 into master will increase coverage by 2.98%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
+ Coverage   94.02%   97.01%   +2.98%     
==========================================
  Files           6        6              
  Lines         201      201              
  Branches       22       22              
==========================================
+ Hits          189      195       +6     
+ Misses         12        5       -7     
- Partials        0        1       +1

Impacted Files	Coverage Δ
pmda/contacts.py	92.59% <0%> (+11.11%)	:arrow_up:

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[kain88-de]

I added a PR welcome badge. Otherwise this looks fine